PhysicsA 18.6 kg monkey hangs from a cord suspended from the ceiling of an elevator. The cord can withstand a tension of 202 N and breaks as the elevator accelerates. What was the elevator's minimum acceleration? (in m/s^2)
February 11, 2015

PhysicsIf a curve with a radius of 91.5 m is perfectly banked for a car traveling 77.4 km/h, what must be the coefficient of static friction for a car not to skid when traveling at 91.6 km/h?
February 11, 2015

PhysicsHow many revolutions per minute would a 15.6 m diameter Ferris wheel need to make for the passengers to feel "weightless" at the topmost point? Do not enter unit.
February 11, 2015

PhysicsAt what minimum speed must a roller coaster be traveling when upside down at the top of a circle so that the passengers will not fall out? Assume a radius of curvature of 8.47 m. (in m/s)
February 11, 2015

PhysicsA projectile is launched with an initial speed V0. At its highest point, the projectile's speed is V0/2 . What was the launch angle above the horizontal? (in deg)
February 1, 2015

PhysicsEddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. After leaving the end of the ski ramp, he lands downhill at a point that is displaced 62.2 m horizontally from the edge of the ramp. His velocity just before landing is 29.0 m/s and points ...
February 1, 2015

PhysicsA golfer, standing on a fairway, hits a shot to a green that is elevated 5.50 m above the point where she is standing. The ball leaves her club at an angle of 37.0° above the ground, with a speed of 31.1 m/s. Find the time that the ball is in the air before it hits the ...
February 1, 2015

PhysicsWhat is the y-component of a vector in the x-y plane whose magnitude is 87.8 and whose x-component is 64.9?
January 21, 2015

physicsA football is kicked at ground level with a speed of 15.4 m/s at an angle of 34.7° to the horizontal. How much later does it hit the ground? (in s)
January 21, 2015

PhysicsRomeo is chucking pebbles gently up to Juliet's window and he wants the pebbles to hit the window with only a horizontal component of velocity (the least possible speed). He is standing at the edge of a rose garden at H = 4.62 m below her window and at D = 5.21 m from the ...
January 21, 2015

pre calculusUse Hooke's Law for springs, which states that the distance a spring is stretched (or compressed) varies directly as the force on the spring. A force of 265 newtons stretches a spring 0.15 meter. (a) What force is required to stretch the spring 0.2 meter? (Round your ...
October 2, 2014

MathThe length of a rectangular board is 10 cm longer than its width. The width of the board is 26 cm. the board is cut into 9 equal pieces. What is the area of each piece? What are the possible dimensions of each piece?
October 1, 2014

chemistryFirst you need to find the limited reactant. You do this by dividing the 2.0 g of NaSO4 by it's molar mass as well as the 2.0 g of Calcium Sulfate dihyrdate (CaCl2 + 2H20) You'll find that the Calcium sulfate is the limited reactant. From there you Take the moles of ...
October 21, 2013

ChemistryA solution of H2SO4(aq) with a molal concentration of 1.66 m has a density of 1.104 g/mL. What is the molar concentration of this solution?
April 29, 2013

ChemistryA solution is made by dissolving 0.624 mol of nonelectrolyte solute in 795 g of benzene. Calculate the freezing point and boiling point of the solution. Tf=_C Tb=_C
April 29, 2013

PhysicsA sports car moving at constant speed travels 150 meters in 5.4 seconds , then brakes and comes to a stop in 3.9 seconds What is the magnitude of its acceleration in ? What is the magnitude of its acceleration in g's (g= 9.80 m/s^2 )?
January 20, 2013

ChemistryYou are planning an experiment that requires 0.0610 mol of nitrogen monoxide gas (NO). What volume would you need at STP? Answer in units of L
December 7, 2012

Maththe common denominator for all of the fractions would be six. as long as you multiply or divide the top and the bottom with the same number you do not break any math rules. 2/3=(2*2)/(3*2)=4/6 1/2=(1*3)/(2*3)=3/6 4/12=(4/2)/(12/2)=2/6 and 5/6=5/6 order the common fractions ...
November 26, 2012

mathy'=2x-1 y'=0 when x is .5 at (.5,-.25) you have a local and global minimum. the global maximum would be infinity because the function is continuous on all real x and the parabola opens up.
November 26, 2012

chemistryWhat pressure would be required for neon at 25 degrees C to have the same density as argon at 25 degress C and 1.00 atm?
November 5, 2012

chemistryWhat pressure would be required for neon at 25 degrees C to have the same density as argon at 25 degress C and 1.00 atm?
November 5, 2012

chemistryWhat pressure would be required for neon at 25 degrees C to have the same density as argon at 25 degress C and 1.00 atm?
November 5, 2012

PhysicsTwo spherical objects with a mass of 2.88 kg each are placed at a distance of 2.12 m apart. How many electrons need to leave each object so that the net force between them becomes zero?
June 7, 2012

PhysicsVector A has magnitude 37 units and direction, counterclockwise from east, of 12.9 degrees. What is the value of its x component to 1 decimal place?
May 12, 2012

chemistryBoth Fe2+ and Cd2+ are precipitated by sulfide. However, they can be quantitatively separated through pH adjustment. You are given a solution containing 0.086 M Fe2+ and 0.062 M Cd2+. Calculate the [H+] range for a saturated H2S solution (ie, [H2S]=0.10 M) in which at least 99...
March 25, 2012

chemistryCalculate the pH range required to separate 99.99% of Cr3+ from Zn2+ by precipitation of Cr(OH)3(s) in a solution that is initially 0.034 M in both Cr3+ and Zn2+. Use the Ksp values from Table 16.2 of Chang and calculate the pH to the nearest 0.01 pH unit. Lowest pH= Highest pH=
March 25, 2012

ChemistryA solution containing Pb2+ and a solution containing IO3- are poured together and quickly mixed. After mixing, the solution contains 0.0030 M Pb2+ and 0.040 M IO3-. Immediately Pb(IO3)2(s), which has Ksp=2.510-13, begins to precipitate. Calculate the free concentrations of Pb2...
March 5, 2012

ChemistryWhat concentration of chloride ion is required to precipitate 99.9% of the lead ion from a solution with [Pb^2+]= 0.045 mol/L ?
March 4, 2012

ChemistyLet's explore the efficiency of chloride ion precipitation in seperating Ag^+ from Pb^2+ in a solution. Suppose that [Pb^2+]= 0.045 mol/L and [Ag^+]= 0.084 mol/L. Calculate the chloride ion concentraion required to just start precipitation of Pb^2+ ion and then calculate ...
March 4, 2012

chemistryA container is charged with hydrogen, nitrogen, and ammonia gases at 120°C and the system was allowed to reach equilibrium. What will happen if the volume of the container is increased at constant temperature? 3H2(g) + N2(g) 2 NH3(g)
February 27, 2012

ChemistryConsider the following equilibrium reaction: NaHCO3(s) Na2CO3(s) + H2O(g) + CO2(g) When 100 g of sodium hydrogen carbonate are added to a reaction vessel, the temperature is increased to 200°C, and the system comes to equilibrium. What happens to the partial pressure of ...
February 27, 2012

Geometrywhat are the 2 lengths on top and bottom of plot 1, and what is the length on plot 3. with the following info I can answer
February 27, 2012

Chemistry HEAT OF FUSIONWhat amount of energy is required to melt a 26.9 g piece of ice at 0oC? The heat of fusion of ice = 333 Jg-1 Heat required to melt the ice = J What amount of energy must be removed from 120 g of water to cool it from 72.1oC to 12.4oC? Specific heat of water = 4.184 JK-1g-1 ...
October 6, 2011

Chemistry HEAT OF FUSIONWhat is the final temperature, in oC, after a 15.0 g piece of ice, at 0oC, is placed in a styrofoam cup with 128 g of water initially at 74.0oC. Assume there is no transfer of heat to or from the surroundings. The specific heat of water = 4.184 JK-1g-1 The heat of fusion of ...
October 6, 2011

ChemistryEthanol (C2H5OH) boils at a temperature of 78.3oC. What amount of energy, in joules, is necessary to heat to boiling and then completely vaporize a 22.8 g sample of ethanol initially at a temperature of 16.5oC. The specific heat of ethanol is approximately constant at 2.44 JK-...
October 6, 2011

BusinessYou have been retained to analyze how many check-in agents should be used at a check-in counter for a large hotel. During normal business hours, customers arrive at a rate of about 24 per hour, and it takes about 7 minutes to complete the check-in process. Both the poisson ...
May 14, 2011

Chemistryyou have to know the initial grams before starting. its not given I have the same question and I can't do it
May 5, 2011

physicsA wave of amplitude 0.37 m interferes with a second wave of amplitude 0.18 m is traveling in the same direction. What is the largest resultant amplitude that can occur?
January 16, 2011

Math About 3/4 of the track team are girls. About 3/4 of these girls are in 8 th grade. What fraction of th e students are grade 8 girls? 1/3?
November 14, 2010

ScienceA student heats 4.00 g of a blue compound, which reacts completely to produce 2.56 g of a white compound and an unknown amount of colorless gas. What is the mass of the gas? Answer?_________ Work area: Reactant (s) = Product (s)
November 30, 2009